Aside from physically drying your Acurite, you can preform a "Salt Test" to test out the accuracy. It could be your particular Acurite that's off and not the actual humidity...
You need: table salt, a see-through container such as a Ziplock baggie, and a small shallow open container, like a bottle cap.
Place a teaspoon of salt in the shallow container and add a few drops of water - just enough to get it wet. (you don't want a salt water solution, just damp salt.) Place the shallow container in the baggie along with the Acurite. (Make sure the salt does not get on the hygrometer).
Seal the baggie with some air trapped inside and let it sit for 6 to 8 hours. Check the hygrometer reading without opening up the baggie. It should read 75%.
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